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11+11+11+11+11+11+11+11+11+11+11+11=

11+11+11+11+11+11+11+11+11+11+11+11=. 11*12. =132. 1+2+3+ ……+98+99+100=. （ 1+100 ） + （ 2+99 ） +……+ （ 50+51 ）. =101*50. =5050. 40. 360÷12=30. 12 条边. 40. FD 40. 30. 40. FD 40. HOME. RT 30. 30. FD 40. HOME. RT 60. FD 40. HOME. RT 90. ……. FD 40. FD 40. FD 40.

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11+11+11+11+11+11+11+11+11+11+11+11=

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  1. 11+11+11+11+11+11+11+11+11+11+11+11= 11*12 =132 1+2+3+ ……+98+99+100= （1+100）+（2+99）+……+（50+51） =101*50 =5050

  2. 40 360÷12=30 12条边

  3. 40 FD 40 30

  4. 40 FD 40 HOME RT 30 30 FD 40 HOME RT 60 FD 40 HOME RT 90 ……

  5. FD 40 FD 40 FD 40 HOME HOME HOME RT 30 RT 60 RT 90 40 方法一 30 …… 方法二 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 ……

  6. FD 40 FD 40 FD 40 HOME HOME HOME RT 30 RT 60 RT 90 40 选择一个你喜欢的方法，在LOGO中画出如下图形。 方法一 30 …… 方法二 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 ……

  7. FD 40 FD 40 FD 40 HOME HOME HOME RT 30 RT 60 RT 90 40 方法一 30 …… 方法二 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 ……

  8. 40 15 24条边 FD 40 BK 40 RT 15

  9. 15 30 FD 40 BK 40 RT 30 FD 40 BK 40 RT 15 FD 40 BK 40 RT 30 FD 40 BK 40 RT 15 × 12 × 24 …… …… FD 40 BK 40 RT 30 FD 40 BK 40 RT 15

  10. 120条边 FD 40 BK 40 RT 3 FD 40 BK 40 RT 3 × 120 …… FD 40 BK 40 RT 3

  11. 12 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 × …… FD 40 BK 40 RT 30 重复的命令 次数 REPEAT 12 [FD 40 BK 40 RT 30] REPEAT命令的基本格式： 次数 [需要重复的命令] REPEAT

  12. REPEAT命令的基本格式： REPEAT 次数 [需要重复的命令] FD 40 BK 40 RT 15 FD 40 BK 40 RT 15 × 24 …… FD 40 BK 40 RT 15 FD 40 BK 40 RT 3 FD 40 BK 40 RT 3 × 120 …… FD 40 BK 40 RT 3 REPEAT [FD 40 BK 40 RT 15] 24

  13. 15 40 3 40 40 在LOGO中用REPEAT命令依次画出如下图形。 30 FD 40 BK 40 RT 30 FD 40 BK 40 RT 30 × 12 …… FD 40 BK 40 RT 30 FD 40 BK 40 RT 15 FD 40 BK 40 RT 15 × 24 …… FD 40 BK 40 RT 15 FD 40 BK 40 RT 3 FD 40 BK 40 RT 3 × 120 …… FD 40 BK 40 RT 3

  14. FD 40 HOME RT 30 FD 40 HOME RT 60 30 FD 40 HOME RT 90 …… FD 40 HOME RT 330 FD 40 HOME RT 360 REPEAT命令只能针对连续重复的命令来简化。

  15. 100 100 100 把你画的蒲公英补充完整。 3 15 30 40 40 40 12条边 24条边 120条边

  16. 用REPEAT命令简化下列命令。 实践 （1） FD 100 RT 120 FD 100 RT 120 FD 100 RT 120 （2）LT 90 FD 60 RT 90 FD 100 RT 90 FD 60 RT 90 FD 100 RT 90 REPEAT [FD 100 RT 120] 3 LT 90 [FD 60 RT 90 FD 100 RT 90] REPEAT 2

  17. 用REPEAT命令简化下列命令。 实践 （1） FD 100 RT 120 FD 100 RT 120 FD 100 RT 120 （2）LT 90 FD 60 RT 90 FD 100 RT 90 FD 60 RT 90 FD 100 RT 90

  18. FD 20 RT 90 FD 20 LT 90 FD 20 RT 90 FD 20 LT 90 FD 20 RT 90 FD 20 LT 90 BK 80 LT 90 FD 80 FD 20 RT 90 FD 20 LT 90 REPEAT 4 [FD 20 RT 90 FD 20 LT 90]

  19. 用REPEAT命令依次画出如下图形。 实践 50 50 10 10

  20. REPEAT命令 作用: 1、绘制简单的规则图形; 2、简化中 中部分连续重复命令。 关键点: 1、发现连续重复的命令; 2、算出连续重复的次数。 格式：REPEAT 次数 [需要重复的命令] 功能：简化连续重复的命令。 图形 程序

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